/usr/share/man/man3/wl_display_get_serial.3.gz is in libwayland-dev 1.9.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/wl_display.3.gz
/usr/share/man/man3/wl_display.3.gz